I would say that the lower priced the design goals, and the lower the bar is for quality control, the more variance you should expect to see between individual units.
So there really isn’t an exact tilt or PEQ setting I would recommend, especially not for a card like that.
Not to mention the drivers can cause just as many problems as the "profit at all costs" methods that Creative Labs employs for the most part… if one doesn’t know what the pitfalls are to avoid.
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That being said, I think the best investment you can make would be to pick up an E-MU 0404 PCIe, or even better… a Marian Trace Alpha. It’s a worthy goal to shoot for, not having to put up with total crap, or even partially crap sound.